/
inputreader_windows.go
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/
inputreader_windows.go
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//go:build windows
// +build windows
package tea
import (
"fmt"
"io"
"os"
"sync"
"github.com/erikgeiser/coninput"
"github.com/muesli/cancelreader"
"golang.org/x/sys/windows"
)
type conInputReader struct {
cancelMixin
conin windows.Handle
cancelEvent windows.Handle
originalMode uint32
// inputEvent holds the input event that was read in order to avoid
// unnecessary allocations. This re-use is possible because
// InputRecord.Unwarp which is called inparseInputMsgFromInputRecord
// returns an data structure that is independent of the passed InputRecord.
inputEvent []coninput.InputRecord
}
var _ cancelreader.CancelReader = &conInputReader{}
func newInputReader(r io.Reader) (cancelreader.CancelReader, error) {
fallback := func(io.Reader) (cancelreader.CancelReader, error) {
return cancelreader.NewReader(r)
}
if f, ok := r.(*os.File); !ok || f.Fd() != os.Stdin.Fd() {
return fallback(r)
}
conin, err := coninput.NewStdinHandle()
if err != nil {
return fallback(r)
}
originalMode, err := prepareConsole(conin,
windows.ENABLE_MOUSE_INPUT,
windows.ENABLE_WINDOW_INPUT,
windows.ENABLE_EXTENDED_FLAGS,
)
if err != nil {
return nil, fmt.Errorf("failed to prepare console input: %w", err)
}
cancelEvent, err := windows.CreateEvent(nil, 0, 0, nil)
if err != nil {
return nil, fmt.Errorf("create stop event: %w", err)
}
return &conInputReader{
conin: conin,
cancelEvent: cancelEvent,
originalMode: originalMode,
}, nil
}
// Cancel implements cancelreader.CancelReader.
func (r *conInputReader) Cancel() bool {
r.setCanceled()
err := windows.SetEvent(r.cancelEvent)
if err != nil {
return false
}
return true
}
// Close implements cancelreader.CancelReader.
func (r *conInputReader) Close() error {
err := windows.CloseHandle(r.cancelEvent)
if err != nil {
return fmt.Errorf("closing cancel event handle: %w", err)
}
if r.originalMode != 0 {
err := windows.SetConsoleMode(r.conin, r.originalMode)
if err != nil {
return fmt.Errorf("reset console mode: %w", err)
}
}
return nil
}
// Read implements cancelreader.CancelReader.
func (*conInputReader) Read(_ []byte) (n int, err error) {
return 0, nil
}
func prepareConsole(input windows.Handle, modes ...uint32) (originalMode uint32, err error) {
err = windows.GetConsoleMode(input, &originalMode)
if err != nil {
return 0, fmt.Errorf("get console mode: %w", err)
}
newMode := coninput.AddInputModes(0, modes...)
err = windows.SetConsoleMode(input, newMode)
if err != nil {
return 0, fmt.Errorf("set console mode: %w", err)
}
return originalMode, nil
}
func waitForInput(conin, cancel windows.Handle) error {
event, err := windows.WaitForMultipleObjects([]windows.Handle{conin, cancel}, false, windows.INFINITE)
switch {
case windows.WAIT_OBJECT_0 <= event && event < windows.WAIT_OBJECT_0+2:
if event == windows.WAIT_OBJECT_0+1 {
return cancelreader.ErrCanceled
}
if event == windows.WAIT_OBJECT_0 {
return nil
}
return fmt.Errorf("unexpected wait object is ready: %d", event-windows.WAIT_OBJECT_0)
case windows.WAIT_ABANDONED <= event && event < windows.WAIT_ABANDONED+2:
return fmt.Errorf("abandoned")
case event == uint32(windows.WAIT_TIMEOUT):
return fmt.Errorf("timeout")
case event == windows.WAIT_FAILED:
return fmt.Errorf("failed")
default:
return fmt.Errorf("unexpected error: %w", err)
}
}
// cancelMixin represents a goroutine-safe cancelation status.
type cancelMixin struct {
unsafeCanceled bool
lock sync.Mutex
}
func (c *cancelMixin) setCanceled() {
c.lock.Lock()
defer c.lock.Unlock()
c.unsafeCanceled = true
}